Coupling valve



Dec. 30, 1941. R. o. DAHLSTROM COUPLING VALVE Filed Feb. 1, 1941 'mwaz/v 0. B) #15 flTZO/ZWFXS. Mum/7 m I pa 5/ 1% Patented Dec. 30, 1941 UNITED STATES PAT-E N' f OF C COUPLING VALVE Reuben 0. Dahlstrom, Milaca, 7 Application February 1, 1941, Serial No. 376,971 2841-19;

1 Claim.

Thisinvention relates to coupling members and more particularly to couplings for use in pressure lines which conduct fluids such as compressed air. Pressure air hoses with which my coupling can be used with advantage are those such as are usedin dental oflices and also in industrial equipment such as pneumatic hammers and drills. a

' Numerous types of valved air line coupling members have been developed heretofore but after a period of use the valves in said-couplings fail to seat properly and there is a resultingloss of air and pressure. This disadvantage is particularly prevalent where'the couplings are used in connection with pneumatichamr'ners and the like, and the vibration to'which they are subjected quickly wears them so that the movable valve members do not properly-align themselves with the valve seat. In most of these structures the valve head-is guided bya relatively stationarylatter and the flange overlies the'end'of the portion of the coupling and the guide becomes worn and improper functioning, results.

It is a general object of my invention to provide avalved coupling including a female member and a male member insertable therein wherein the male member. moves the valvehead from its seat as the two members are connectedtogether, and wherein the valvehead has what might be termed a'full floating action relative to the remainder of the coupling andwherein it is retained in proper relationship to-the valve seat without providing relative rigid guides therefor.

These and other objects and advantages of the invention will more fully appear fromthe following description made in connection with the accompanying drawing, wherein like reference characters refer to the same parts throughout the views, and, in which:

= Fig. 1 is a side view of an embodiment of my invention;

such as'might be used in connection with-a spray gun;and Fig.8 shows a straight connecting stemwith an internally threaded portion at one end. i I

InFigs. 1 and 2 there is illustrated an airhose In whose end has received therein a sleeve ll formed on the end of a female" coupling member I 2. Around the sleeve is disposed a band l3 which hasbevelled outer surfaces as shown in Fig. '2. A threaded flange l4 extends concentrically "to the sleeve II for a portion of the length of the tubing ID; -A threaded -collarl5 is secured upon the threaded flange I4 and adapted to press the tubing Ill against the bevelled jcollar l3 to tightly grip the same. The female "coupling member II :has a cylindrical" element 16 threadedly connected thereto andasubstantially L-shaped annulus I1 is positioned'within the sleeve l6 to provide an inwardly extending annular'shoulder. A rubber or other'suitable packing' ring 18 lies against the inwardly extending shoulder of the annulus l1, and these parts-are held rigidly in position due to the clamping action between the end of. the female connecting member l3 and the shoulder lBa on the sleeve-l6. "A rubber packing ring 19 is also positioned wit the sleeve l6 as is well known in'the art.

A valve head 20having an annular flange-.2 is positioned within the femalemember l2 and, as clearly shown inFig. 2,=.the valve head 20 is of considerably less diameter than the. interior. diameter of said member I2. It should alsobe noted that the right-hand portion of said valve head 20 projects into the annular packing ring I 8 with considerable clearance between saicl head and packing ring so that there is no-guiding action Fig. 2 is an enlarged viewpartially broken away and partially in section of an assembly such as that shown in Fig. 1; a

- Fig. 3is a section taken approximatelypn the line 3-3 of Fig. 2; i d

Fig. 4 is a section taken approximately onthe I line 4-4 ofFig. 2;

Fig. 51s a side elevation of an adaptationof my invention for coupling a hose with a supply p pe;

Fig. 6 is a view partially in section of the pipe J connecting sleeve shown atthe right-hand side of Fi 5;

Fig. 7 is a curved male connecting member ofv the head. by the packing ring or anyother relatively stationary part-oi .the coupling; The

head is provided with a plurality of openings 22 which afford communicationfrom the exterior of said head to an interior hollow portion 23. Thus when thezvalveis off its seat, as shown in Fig. 2, air can flow from the left through the hose I 0, around the left-hand portion-of the valve head 20, through the openings Y22, and hollow portion 23 to the right-handside of the valve,

head 20 and bears against the valve head flange 2! thus yieldably urging the valve head toward the packing ring on seat I53. The smaller end of the spring 24 is shown to be of considerably less diameter than the interior of said member l2 at that portion where the spring is located, while the larger end is of substantially the same size as the inner diameter of the member l2.

A male coupling member 26 is shown in Figs. 1, 2 and 5. and is provided withatapered end portion 21 and a threaded end 23. The coupling member 26 can be suitably connected to a pipe line, tool or other device to which air is to be supplied. This coupling member has a pair of oppositely disposed pins or lugs 23 extending radially therefrom, and the tapered end 2| is adapted to be inserted into the sleeve l6 which forms a portion of the female coupling member. The sleeve I6 is provided at its right-hand end with an inwardly, extending flange 30. This flange has a pair of cut-outs 3| formed thereinadapted to admit the lugs 29 on the: male coupling member 36 when the member is inserted in sleeve i6.

The inner side wall 3 of theflange 30 is providedwith a pair of sockets ;or depressions 32 which, as .best shown in Fig. 4, are at right-angles to the cut-outs 3i. When the male member 26 is vinserted in the sleeve l6, it is turned 90 degrees so that the pins or lugs 23 will seat in the depressions 32. I. They are held in this position by the action oi the coil spring 24 which bears against the valve head 20, the latter 1 being in contact with the inner end of the male, coupling member 26.. v v

Insertion of the male member 26 in the sleeve i6 brings the inner end of member, 26 into contactwith the shoulder formed by the countersink 26a in the inner hollow portion '23 i of the vvalve head 30, and moves said valvezhead to the left, as..viewed in .Fig. 2. This movement is against thezaction oi the frusto-conical spring 24.

Air can then flow through the apertures 22 in the valve head and throughthe bore of. the male .coupling member 26. When the member 26 is removed from the sleeve It, the valve head 20 will follow said member 26 .as it is withdrawn and will seat tightly against the packing ring l3 entirely around the valve head flange 2|. This is due to the fact that the valve head 20 is substantially floating in the femalecoupling member and canbe pressed evenly against the packing ring i6 by the action of the coil spring 24. The spring 24 which holds the valve head in 1 position cannot be displaced because of the fact that itslarger end is substantially the-same size 'as the inner diameter of .the female'coupling sleeve i2. Howievenmovement of the valve head 20 to a proper seating position is permitted due to the lesser diameter of the valvehead and the in such a manner as to insure proper engagement of said head with the packing ring i6.

In Fig. there isshown a pipe line '33. Connected'to the T 34 in the'pipe line 33 is an adapter 33, best shown in Fig. 6. The adapter 36 takes the place of the female coupling sleeve against the air valve head.

,thereto to receive the threaded portion 23 of the coupling member 26. j r Fig. '7 illustrates a curved sleeve or male connector member 39 which can be used on spray guns or other articles where a connection of that shape is desired.

In Fig. 8 there is shown a male coupling member 46 which has an internally threaded portion 4|, which maybe used where such a connection 'is advantageous.

From the foregoing description it willbe seen that I have provided a valved air hose coupling which can be connected and disconnected quickly, and wherein the movable valve head is so supported in the coupling by its spring and the male coupling member that it will at all times properly seat against the, packing ringand wherein such seating is noteifeetedby jarring of the connection and wherein no relatively stationary guides are provided which mightwear after extensive use and prevent the valve from closing properly. I have also provided a simple and efieetive bayonet joint type of connector for the maleand female coupling members which will securely hold them and wherein the connection is .tight- ,ened by. the action of the spring which bears It will, of course, be understood that various changesmay bemade in the form, details, arrangement and proportions of the various parts without departing from the scope of my invention. 7 j

What is claimed is: Inacoupling, a female member including a part adapted for attachment to a hose and having a bore of: relatively small diameterat'the hose attaching end anda bore of relatively large diameter at the other end defined from the small diameter bore by an abrupt shoulder, a second part .having a bore of relatively' large diameter screwed into the larger bore end of the first part, said second part having a boreof relatively small diameter at its other end and a shoulder between its bores, a sleeve in the second part resting on the shoulder ofthe second part at one end'and having an internal flange at its other end, an elastic annul'arvalve seat clamped between the flanged end or the sleeve and the adjacent end of the 'said' first "part, a valve having a diameter less than the opening in the valve seat and provided with aflange closing on said valve seat, a

- "a packing ring disposed between the flange of the sleeve and .the shoulder of the. second part, and a tubular male member fltting in said packing ring and sealing the valve at the periphery of said recess.

REUBEN o. DAHLS'I'ROM. 

